The Christian Lutheranism he founded is also called Lutheranism.

His ideas were established by opposing Catholicism.

Catholicism believes that justice is proved by faith and good deeds.

The main contents of good deeds are: the seven sacred things, the ten commandments of God, and the four rules of holy teaching.

Luther thought that these were not necessary conditions for salvation,

But in order to express gratitude to God, these should also be done properly.

Catholicism believes that this is not gratitude to God, but a necessary condition for salvation.

If these conditions do not reach a certain level, they cannot be preserved.

Later, all Protestant factions also believed in the purpose of "justification by faith".

That is to say:

People who are considered saved by Christianity are rarely saved by Catholicism.

There is a famous Catholic saying: worship and praise cannot be saved, but repentance can be saved.

This sentence is actually aimed at Protestantism.